linux-kernel - Re: [PATCH v2] ASoC: Intel: cirrus-common: Use UID to map correct amp to prefix

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Date:   Wed, 27 Jul 2022 11:36:43 -0500
From:   Pierre-Louis Bossart <pierre-louis.bossart@...ux.intel.com>
To:     Stefan Binding <sbinding@...nsource.cirrus.com>,
        Mark Brown <broonie@...nel.org>,
        Liam Girdwood <lgirdwood@...il.com>,
        Brent Lu <brent.lu@...el.com>, xliu <xiang.liu@...rus.com>
Cc:     alsa-devel@...a-project.org, linux-kernel@...r.kernel.org,
        patches@...nsource.cirrus.com,
        Vitaly Rodionov <vitalyr@...nsource.cirrus.com>
Subject: Re: [PATCH v2] ASoC: Intel: cirrus-common: Use UID to map correct amp
 to prefix




> +/*
> + * Expected UIDs are integers (stored as strings).
> + * UID Mapping is fixed:
> + * UID 0x0 -> WL
> + * UID 0x1 -> WR
> + * UID 0x2 -> TL
> + * UID 0x3 -> TR
> + * Note: If there are less than 4 Amps, UIDs still map to WL/WR/TL/TR. Dynamic code will only create
> + * dai links for UIDs which exist, and ignore non-existant ones.

is this intentional to support all variations of 1,2,3 and 4 amplifiers
being present?

Or is the intent to really support 2 or 4?

> + * Return number of codecs found.
> + */
> +static int cs35l41_compute_codec_conf(void)
> +{
> +	const char * const uid_strings[] = { "0", "1", "2", "3" };
> +	unsigned int uid, sz = 0;
> +	struct acpi_device *adev;
> +	struct device *physdev;
> +
> +	for (uid = 0; uid < CS35L41_MAX_AMPS; uid++) {
> +		adev = acpi_dev_get_first_match_dev(CS35L41_HID, uid_strings[uid], -1);
> +		if (!adev) {
> +			pr_warn("Cannot find match for HID %s UID %u (%s)\n", CS35L41_HID, uid,
> +				cs35l41_name_prefixes[uid]);

A warning is a bit strong if some valid configurations don't expose all
4 codecs.

> +			continue;
> +		}
> +		physdev = get_device(acpi_get_first_physical_node(adev));
> +		cs35l41_components[sz].name = dev_name(physdev);
> +		cs35l41_components[sz].dai_name = CS35L41_CODEC_DAI;
> +		cs35l41_codec_conf[sz].dlc.name = dev_name(physdev);
> +		cs35l41_codec_conf[sz].name_prefix = cs35l41_name_prefixes[uid];
> +		acpi_dev_put(adev);
> +		sz++;
> +	}
> +	return sz;